TY - JOUR
T1 - Superconducting behavior of BaTi2Bi2O and its pressure dependence
AU - Wang, Yanan
AU - Li, Huan
AU - Taguchi, Tomoya
AU - Suzuki, Ai
AU - Miura, Akari
AU - Goto, Hidenori
AU - Eguchi, Ritsuko
AU - Miyazaki, Takafumi
AU - Liao, Yen Fa
AU - Ishii, Hirofumi
AU - Kubozono, Yoshihiro
N1 - Funding Information:
This study was partly supported by Grants-in-Aid (17K05500, 18K04940, 18K18736, and 19H02676) from Japan Society for the Promotion of Science (JSPS) and by the Program for Promoting the Enhancement of Research Universities. The XRD measurements at SPring-8 were supported by 2018B4140 and 2019A4131.
Publisher Copyright:
© the Owner Societies.
PY - 2020/10/28
Y1 - 2020/10/28
N2 - A new superconducting sample, BaTi2Bi2O, was synthesized and characterized over a wide pressure range. The superconducting transition temperature, Tc, of BaTi2Bi2O was 4.33 K at ambient pressure. The crystal structure was tetragonal (space group of P4/mmm (No. 123)), according to the X-ray diffraction (XRD) pattern at ambient pressure. The XRD pattern was analyzed using the Le Bail method. The magnetic-field dependence of the magnetization at different temperatures was precisely investigated to elucidate the characteristics of the superconductivity. The pressure-dependent XRD patterns showed absence of structural phase transitions up to 19.8 GPa. The superconducting properties of BaTi2Bi2O were investigated under pressure. Tc monotonously increased with the pressure (p) up to 4.0 GPa and saturated above 4.0 GPa. The variations in the Tc-p plot were thoroughly analyzed. The Cooper pair symmetry (or superconducting pairing mechanism) was analyzed based on the magnetic field dependence of the superconductivity at ambient and high pressures, which indicated a sign of p-wave pairing for the superconductivity of BaTi2Bi2O, i.e., topologically nontrivial sign was suggested for BaTi2Bi2O.
AB - A new superconducting sample, BaTi2Bi2O, was synthesized and characterized over a wide pressure range. The superconducting transition temperature, Tc, of BaTi2Bi2O was 4.33 K at ambient pressure. The crystal structure was tetragonal (space group of P4/mmm (No. 123)), according to the X-ray diffraction (XRD) pattern at ambient pressure. The XRD pattern was analyzed using the Le Bail method. The magnetic-field dependence of the magnetization at different temperatures was precisely investigated to elucidate the characteristics of the superconductivity. The pressure-dependent XRD patterns showed absence of structural phase transitions up to 19.8 GPa. The superconducting properties of BaTi2Bi2O were investigated under pressure. Tc monotonously increased with the pressure (p) up to 4.0 GPa and saturated above 4.0 GPa. The variations in the Tc-p plot were thoroughly analyzed. The Cooper pair symmetry (or superconducting pairing mechanism) was analyzed based on the magnetic field dependence of the superconductivity at ambient and high pressures, which indicated a sign of p-wave pairing for the superconductivity of BaTi2Bi2O, i.e., topologically nontrivial sign was suggested for BaTi2Bi2O.
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U2 - 10.1039/d0cp04771f
DO - 10.1039/d0cp04771f
M3 - Article
C2 - 33034332
AN - SCOPUS:85094219832
VL - 22
SP - 23315
EP - 23322
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 40
ER -